[Greg Hermann]

At 3:14 AM 11/13/01, Andrew R. Ghali wrote:
>Guys, for what it's worth, I believe flapper AFM's actually are reading
>air MOMENTUM - in other words, higher velocity air at lower pressure can
>cause the same reading as denser, lower velocity air.  Now, whether that
>is linear with volume, I do not know.
>
>Andrew

Nope. In effect, they are reading the stagnation pressure of the air.

Again--the deflection of the flapper varies with the square of the air
velocity, but only directly with the air's density.

Greg
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